I would like to book a new iPhone 11 Pro, but since I'm from Slovakia, will it be compatible with our mobile networks?

FYI, iPhone do not have International warranty.

Warranty & services are valid only in country of purchase.

So if you need that you have to bring it back to USA.

Tip: Carrier unlock iPhones are only sold in the Apple Stores and it's not available on opening day.

You do what you want with your money. But every day someone comes here complaining they bought a phone in US when they live in another country and something's gone wrong and Apple won't service their phone.

If you buy your phone here, you need to make sure you're buying one which will work in your country, and Apple sells phones by region. How fun it would be to get home and find out your phone isn't compatible with the networks in Slovakia! You won't be able to send it back to the US. You'd have to get on a plane and return it to the US.

You'll have no warranty in Slovakia. If there is a savings by purchasing your phone here, those savings will quickly evaporate if you have any issue.

Buy your phone in your home country.

You need to order iPhone 11 Pro when it releases in your country.